Definitions

1. noun

the outermost layer of cells that forms the membranes of the blastula in early embryonic development, and eventually forms the amnion, allantois, and chorionic villi.

“The formation of the chorion during embryonic development is crucial for the further growth and health of the embryo.”

2. noun

a thin, membrane-like structure in the embryo that eventually gives rise to the placenta and umbilical cord.

“The chorion is responsible for exchanging gases and nutrients between the mother’s bloodstream and the embryo’s bloodstream.”